Adjustment Of Refrigerant Charge - Nordyne Two Stage R-410A Split System User's Information/Installation Instructions

through the test function, this delay is cancelled
and the compressor will not de-energize. This 2-
stage unit will defrost in whichever stage is called
for by the thermostat. If only Y1 is energized, then
the unit will defrost in low stage. If Y1 and Y2 are
energized, the unit will defrost in high stage.
Note: All units are shipped from the factory with
the default time setting of 30 minutes. Maximum
heating performance can be achieved by setting
the time to 90 minutes.
Defrost Test Procedure
1. Terminals "R"-"C" must have 18-30v present
between them in order for time delay and
defrost sequences to be initiated.
2. With compressor running in heat mode,
fi rst jump the "T2"-"DFT" test pins. This
will indicate to board that defrost T-stat is
closed. Defrost T-stat closes at 32°, opens
at 68°.
3. Next jump the "Test" pin to "C" on terminal
strip. This will initiate defrost test in 5, 10 or
15 seconds (This is determined by 30, 60
or 90 minutes defrost pin settings). Factory
setting will be 30 minutes.
4. When the reversing valve shifts to the
defrost mode, quickly remove jumper from
"Test"-"C". If the jumper is not removed
within a 5 second period, the defrost test
will terminate. Unit will continue to stay in
defrost mode Until :
A) Board recognizes that defrost
sensor has reached 68° and
opened or
B) "T2"-"DFT" jumper is removed or
C) 10 minutes have elapsed (board
override)
If the above steps will not initiate a defrost, replace
the defrost board.
Anti Short Cycle Timer Test
The 5 minute time delay feature can be bypassed
or shortened to 1 second by jumping the "Test"
to "C" terminal.
Note: If jumper is left on the "Test" to "common"
pins permanently, the defrost cycle will become
inoperable.

Adjustment of Refrigerant Charge:

!
CAUTION:
Split system heat pump equipment
contains liquid and gaseous refrigerant
under pressure. Adjustment of
refrigerant charge should only be
attempted by qualified, trained
personnel thoroughly familiar with the
equipment. Under no circumstances
should the homeowner attempt to
install and/or service this equipment.
Failure to comply with this warning
could result in equipment damage,
personal injury, or death.
NOTE: The unit must be charged while both fi rst
and second stages are operating.
NOTE: To achieve rated capacity and effi ciency
the compressor must be exposed to refrigerant
for at least 24 hours prior to running and then
must be run for a minimum of 12 hours.
NOTE: The following Refrigerant Charging
Charts are applicable to listed assemblies of
equipment and at listed airfl ows for the indoor
coil. Assemblies of indoor coils and outdoor units
not listed are not recommended.
Procedure for charging an R-410A
unit in AC mode at outdoor tempera-
tures above 65F.
1. With the system operating at steady-state,
measure the liquid refrigerant pressure in
psig at the service valve.
2. Measure the liquid refrigerant temperature
in Fahrenheit at the service valve.
3. For the temperature measured, determine
the required liquid refrigerant pressure from
the appropriate charging chart below.
4. If the pressure measured in step 1 is
greater than the required liquid refrigerant
pressure determined in step 4, then there
is too much charge in the system. Remove
refrigerant and repeat steps 1 through 3
until the system is correctly charged.
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